n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 2 |
3 | -4 |
4 | 16 |
5 | -56 |
6 | 328 |
7 | -1576 |
8 | 11712 |
9 | -70912 |
10 | 638720 |
11 | -4668544 |
12 | 49459840 |
13 | -423673472 |
14 | 5159926528 |
15 | -50674728448 |
16 | 697030680576 |
17 | -7717401038848 |
18 | 118233272496128 |
19 | -1456461190426624 |
20 | 24578235697610752 |
21 | -333308651379949568 |
[1,-1,2,-4,16,-56,328,-1576,11712,-70912,638720, -4668544,49459840,-423673472,5159926528, -50674728448,697030680576,-7717401038848, 118233272496128,-1456461190426624, 24578235697610752,-333308651379949568] |